*CHECKING THE VISCOUS/CABIN HEATER RELAY

For a complete wiring diagram Refer to Section 8W

Possible Causes

FUSED B+ CIRCUIT OPEN

(K132) CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE

(K347) CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO GROUND

(A119) CABIN HEATER RELAY OUTPUT CIRCUIT OPEN

CABIN HEATER RELAY

Diagnostic Test

1.VISCOUS/CABIN HEATER RELAY ACTUATOR TEST

Is the Cabin Heater Relay clicking during the actuator test?

Yes

Test Complete.

Go To2

2.FUSED B+ CIRCUIT OPEN

NOTE: If the Cabin Heater Relay fuse or fuselink is open, refer to the system schematics for all circuits that are powered by the Cabin Heater Relay fuse or fuselink to determine the cause of the blown fuse/fuselink.

Does the test light illuminate brightly?

Yes

Go To3

Repair the Fused B+ (Fuse/Fuselink) circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

3.CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE

Is the voltage above 1.0 volt?

Yes

Repair the (A119) Cabin Heater Relay Output circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To4

4.CABIN HEATER RELAY OUTPUT CIRCUIT SHORTED TO GROUND

Is the resistance above 1000 ohms?

Yes

Go To5

Repair the (K132) Cabin Heater Relay Output circuit for a short to ground. Inspect the fuse or fuselink and replace as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

5.CABIN HEATER RELAY OUTPUT CIRCUIT OPEN

Does the test light illuminate brightly?

Yes

Go To6

Repair the (A119) Cabin Heater Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

6.CABIN HEATER RELAY

If there are no possible causes remaining, view repair.

Repair

Replace the Cabin Heater Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).